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The secrets of the ‘railway stinks’ are revealed in this episode from the East Midlands. Natasha Raskin Sharp meets retired railway chemist Dave Smith, who spent 34 years analysing trains and tracks. Dave and his colleagues earned their dubious nickname from working in smelly laboratories.

It’s full steam ahead at the antiques fair at Uttoxeter Racecourse, where two teams of friends hope that Natasha’s challenges won’t derail their shopping plans. With expert Irita Marriott by their side, supermarket workers Darren and Sarah spot an early-20th-century tray made of copper from HMS Britannia. It doesn’t float Irita’s boat, so the tray goes on the back burner.

Over on the other side of the fair, John Cameron and his blues, Barbara and Amanda, put the squeeze on the seller of a bacon press until they spot a dink in the metal. And eyebrows are raised at Colin Young’s auction when a piece of Scandinavian jewellery, rejected by one team, goes under the hammer for their opponents.